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/*
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* (c) 2003 Mario de Sousa
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*
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* Offered to the public under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* This code is made available on the understanding that it will not be
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* used in safety-critical situations without a full and competent review.
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*/
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/*
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* An IEC 61131-3 IL and ST compiler.
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*
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* Based on the
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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*
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*/
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/* Determine the data type of a specific variable instance, including
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* function block instances.
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* A reference to the relevant variable declaration is returned.
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* The variable instance may NOT be a member of a structure of a memeber
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* of a structure of an element of an array of ...
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*
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* example:
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* window.points[1].coordinate.x
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* window.points[1].colour
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* etc... ARE NOT ALLOWED!
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*
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* This class must only be passed the name of the variable that will appear
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* in the variable declaration. In the above examples, this would be
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* 'window' !!
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*
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*
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* If you need to pass a complete name of a variable instance (such as
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* 'window.points[1].coordinate.x') use the search_varfb_instance_type_c instead!
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*/
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/* Note that current_type_decl that this class returns may reference the
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* name of a type, or the type declaration itself!
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* For an example of the first, consider a variable declared as ...
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* x : AAA;
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* where the AAA type is previously declared as whatever.
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* For an example of the second, consider a variable declared as ...
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* x : array of int [10]; ----> is allowed
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*
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* If it is the first, we will return a reference to the name, if the second
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* we return a reference to the declaration!!
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*/
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class search_var_instance_decl_c: public search_visitor_c {
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private:
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symbol_c *search_scope;
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symbol_c *search_name;
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symbol_c *current_type_decl;
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/* variable used to store the type of variable currently being processed... */
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/* Will contain a single value of generate_c_vardecl_c::XXXX_vt */
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unsigned int current_vartype;
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public:
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search_var_instance_decl_c(symbol_c *search_scope) {
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this->current_vartype = none_vt;
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this->search_scope = search_scope;
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this->search_name = NULL;
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this->current_type_decl = NULL;
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}
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symbol_c *get_decl(symbol_c *variable_instance_name) {
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this->search_name = variable_instance_name;
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return (symbol_c *)search_scope->accept(*this);
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}
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unsigned int get_vartype() {
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return current_vartype;
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}
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public:
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/* the types of variables that need to be processed... */
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static const unsigned int none_vt = 0x0000;
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static const unsigned int input_vt = 0x0001; // VAR_INPUT
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static const unsigned int output_vt = 0x0002; // VAR_OUTPUT
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static const unsigned int inoutput_vt = 0x0004; // VAR_IN_OUT
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static const unsigned int private_vt = 0x0008; // VAR
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static const unsigned int temp_vt = 0x0010; // VAR_TEMP
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static const unsigned int external_vt = 0x0020; // VAR_EXTERNAL
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static const unsigned int global_vt = 0x0040; // VAR_GLOBAL
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static const unsigned int located_vt = 0x0080; // VAR <var_name> AT <location>
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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void *visit(library_c *symbol) {
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/* we do not want to search multiple declaration scopes,
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* so we do not visit all the functions, fucntion blocks, etc...
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*/
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return NULL;
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}
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/******************************************/
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/* B 1.4.3 - Declaration & Initialisation */
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/******************************************/
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/* edge -> The F_EDGE or R_EDGE directive */
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// SYM_REF2(edge_declaration_c, edge, var1_list)
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// TODO
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void *visit(input_declarations_c *symbol) {
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current_vartype = input_vt;
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void *res = symbol->input_declaration_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
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/* option -> may be NULL ! */
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void *visit(output_declarations_c *symbol) {
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current_vartype = output_vt;
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void *res = symbol->var_init_decl_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* VAR_IN_OUT var_declaration_list END_VAR */
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void *visit(input_output_declarations_c *symbol) {
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current_vartype = inoutput_vt;
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void *res = symbol->var_declaration_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* VAR [CONSTANT] var_init_decl_list END_VAR */
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/* option -> may be NULL ! */
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/* helper symbol for input_declarations */
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void *visit(var_declarations_c *symbol) {
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current_vartype = private_vt;
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void *res = symbol->var_init_decl_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* VAR RETAIN var_init_decl_list END_VAR */
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void *visit(retentive_var_declarations_c *symbol) {
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current_vartype = private_vt;
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void *res = symbol->var_init_decl_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
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void *visit(located_var_declarations_c *symbol) {
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current_vartype = located_vt;
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void *res = symbol->located_var_decl_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(external_var_declarations_c, option, external_declaration_list)
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void *visit(external_var_declarations_c *symbol) {
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current_vartype = external_vt;
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void *res = symbol->external_declaration_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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//SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
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void *visit(global_var_declarations_c *symbol) {
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current_vartype = global_vt;
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void *res = symbol->global_var_decl_list->accept(*this);
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if (res == NULL) {
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current_vartype = none_vt;
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}
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return res;
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}
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/* var1_list is one of the following...
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* simple_spec_init_c *
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* subrange_spec_init_c *
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* enumerated_spec_init_c *
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*/
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// SYM_REF2(var1_init_decl_c, var1_list, spec_init)
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void *visit(var1_init_decl_c *symbol) {
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current_type_decl = symbol->spec_init;
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return symbol->var1_list->accept(*this);
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}
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/* var1_list ',' variable_name */
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// SYM_LIST(var1_list_c)
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void *visit(var1_list_c *symbol) {
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list_c *list = symbol;
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for(int i = 0; i < list->n; i++) {
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if (compare_identifiers(list->elements[i], search_name) == 0)
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/* by now, current_type_decl should be != NULL */
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return current_type_decl;
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}
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return NULL;
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}
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/* name_list ':' function_block_type_name ASSIGN structure_initialization */
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/* structure_initialization -> may be NULL ! */
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void *visit(fb_name_decl_c *symbol) {
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current_type_decl = symbol->function_block_type_name;
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return symbol->fb_name_list->accept(*this);
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}
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/* name_list ',' fb_name */
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void *visit(fb_name_list_c *symbol) {
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list_c *list = symbol;
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for(int i = 0; i < list->n; i++) {
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if (compare_identifiers(list->elements[i], search_name) == 0)
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/* by now, current_fb_declaration should be != NULL */
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return current_type_decl;
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}
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return NULL;
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}
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/* var1_list ':' array_spec_init */
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// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
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void *visit(array_var_init_decl_c *symbol) {
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current_type_decl = symbol->array_spec_init;
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return symbol->var1_list->accept(*this);
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}
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/* var1_list ':' initialized_structure */
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// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
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void *visit(structured_var_init_decl_c *symbol) {
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current_type_decl = symbol->initialized_structure;
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return symbol->var1_list->accept(*this);
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}
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/* var1_list ':' array_specification */
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// SYM_REF2(array_var_declaration_c, var1_list, array_specification)
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void *visit(array_var_declaration_c *symbol) {
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current_type_decl = symbol->array_specification;
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return symbol->var1_list->accept(*this);
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}
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/* var1_list ':' structure_type_name */
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// SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
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void *visit(structured_var_declaration_c *symbol) {
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current_type_decl = symbol->structure_type_name;
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return symbol->var1_list->accept(*this);
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}
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/* [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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// SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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// TODO!!
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/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
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// SYM_REF2(external_declaration_c, global_var_name, specification)
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void *visit(external_declaration_c *symbol) {
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if (compare_identifiers(symbol->global_var_name, search_name) == 0)
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return symbol->specification;
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return NULL;
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}
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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void *visit(global_var_decl_c *symbol) {
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if (symbol->type_specification != NULL) {
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current_type_decl = symbol->type_specification;
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return symbol->global_var_spec->accept(*this);
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}
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else
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return NULL;
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}
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/*| global_var_name location */
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//SYM_REF2(global_var_spec_c, global_var_name, location)
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void *visit(global_var_spec_c *symbol) {
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if (symbol->global_var_name != NULL && compare_identifiers(symbol->global_var_name, search_name) == 0)
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return current_type_decl;
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else
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return symbol->location->accept(*this);
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}
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/*| global_var_list ',' global_var_name */
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//SYM_LIST(global_var_list_c)
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void *visit(global_var_list_c *symbol) {
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list_c *list = symbol;
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for(int i = 0; i < list->n; i++) {
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if (compare_identifiers(list->elements[i], search_name) == 0)
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/* by now, current_type_decl should be != NULL */
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return current_type_decl;
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}
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return NULL;
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}
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/* [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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void *visit(located_var_decl_c *symbol) {
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if (symbol->variable_name != NULL && compare_identifiers(symbol->variable_name, search_name) == 0) {
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return symbol->located_var_spec_init;
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}
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else
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return NULL;
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}
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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// TODO!!
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/*| global_var_name location */
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// SYM_REF2(global_var_spec_c, global_var_name, location)
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// TODO!!
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|
339 |
/* AT direct_variable */
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|
|
340 |
// SYM_REF2(location_c, direct_variable, unused)
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|
|
341 |
// TODO!!
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|
342 |
|
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|
343 |
/*| global_var_list ',' global_var_name */
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|
|
344 |
// SYM_LIST(global_var_list_c)
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|
345 |
// TODO!!
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|
346 |
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|
347 |
/* var1_list ':' single_byte_string_spec */
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|
348 |
// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
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|
|
349 |
void *visit(single_byte_string_var_declaration_c *symbol) {
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|
|
350 |
current_type_decl = symbol->single_byte_string_spec;
|
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|
351 |
return symbol->var1_list->accept(*this);
|
|
|
352 |
}
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|
353 |
|
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|
354 |
/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
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|
355 |
/* integer ->may be NULL ! */
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|
356 |
/* single_byte_character_string ->may be NULL ! */
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|
357 |
// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
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|
358 |
// TODO!!
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|
|
359 |
|
|
|
360 |
/* var1_list ':' double_byte_string_spec */
|
|
|
361 |
// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
|
|
|
362 |
void *visit(double_byte_string_var_declaration_c *symbol) {
|
|
|
363 |
current_type_decl = symbol->double_byte_string_spec;
|
|
|
364 |
return symbol->var1_list->accept(*this);
|
|
|
365 |
}
|
|
|
366 |
|
|
|
367 |
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
|
|
|
368 |
/* integer ->may be NULL ! */
|
|
|
369 |
/* double_byte_character_string ->may be NULL ! */
|
|
|
370 |
// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
|
|
|
371 |
// TODO!!
|
|
|
372 |
|
|
|
373 |
/* variable_name incompl_location ':' var_spec */
|
|
|
374 |
// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
|
|
|
375 |
// TODO!!
|
|
|
376 |
|
|
|
377 |
/* AT incompl_location_token */
|
|
|
378 |
// SYM_TOKEN(incompl_location_c)
|
|
|
379 |
// TODO!!
|
|
|
380 |
|
|
|
381 |
|
|
|
382 |
/**************************************/
|
|
|
383 |
/* B.1.5 - Program organization units */
|
|
|
384 |
/**************************************/
|
|
|
385 |
/***********************/
|
|
|
386 |
/* B 1.5.1 - Functions */
|
|
|
387 |
/***********************/
|
|
|
388 |
// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)
|
|
|
389 |
void *visit(function_declaration_c *symbol) {
|
|
|
390 |
/* functions have a variable named after themselves, to store
|
|
|
391 |
* the variable that will be returned!!
|
|
|
392 |
*/
|
|
|
393 |
if (compare_identifiers(symbol->derived_function_name, search_name) == 0)
|
|
|
394 |
return symbol->type_name;
|
|
|
395 |
|
|
|
396 |
/* no need to search through all the body, so we only
|
|
|
397 |
* visit the variable declarations...!
|
|
|
398 |
*/
|
|
|
399 |
return symbol->var_declarations_list->accept(*this);
|
|
|
400 |
}
|
|
|
401 |
|
|
|
402 |
/*****************************/
|
|
|
403 |
/* B 1.5.2 - Function Blocks */
|
|
|
404 |
/*****************************/
|
|
|
405 |
void *visit(function_block_declaration_c *symbol) {
|
|
|
406 |
/* no need to search through all the body, so we only
|
|
|
407 |
* visit the variable declarations...!
|
|
|
408 |
*/
|
|
|
409 |
return symbol->var_declarations->accept(*this);
|
|
|
410 |
}
|
|
|
411 |
|
|
|
412 |
/**********************/
|
|
|
413 |
/* B 1.5.3 - Programs */
|
|
|
414 |
/**********************/
|
|
|
415 |
void *visit(program_declaration_c *symbol) {
|
|
|
416 |
/* no need to search through all the body, so we only
|
|
|
417 |
* visit the variable declarations...!
|
|
|
418 |
*/
|
|
|
419 |
return symbol->var_declarations->accept(*this);
|
|
|
420 |
}
|
|
|
421 |
|
|
|
422 |
|
|
|
423 |
/********************************/
|
|
|
424 |
/* B 1.7 Configuration elements */
|
|
|
425 |
/********************************/
|
|
|
426 |
|
|
|
427 |
/*
|
|
|
428 |
CONFIGURATION configuration_name
|
|
|
429 |
optional_global_var_declarations
|
|
|
430 |
(resource_declaration_list | single_resource_declaration)
|
|
|
431 |
optional_access_declarations
|
|
|
432 |
optional_instance_specific_initializations
|
|
|
433 |
END_CONFIGURATION
|
|
|
434 |
*/
|
|
|
435 |
/*
|
|
|
436 |
SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
|
|
|
437 |
*/
|
|
|
438 |
void *visit(configuration_declaration_c *symbol) {
|
|
|
439 |
/* no need to search through all the configuration, so we only
|
|
|
440 |
* visit the global variable declarations...!
|
|
|
441 |
*/
|
|
|
442 |
if (symbol->global_var_declarations != NULL)
|
|
|
443 |
return symbol->global_var_declarations->accept(*this);
|
|
|
444 |
else
|
|
|
445 |
return NULL;
|
|
|
446 |
}
|
|
|
447 |
|
|
|
448 |
/*
|
|
|
449 |
RESOURCE resource_name ON resource_type_name
|
|
|
450 |
optional_global_var_declarations
|
|
|
451 |
single_resource_declaration
|
|
|
452 |
END_RESOURCE
|
|
|
453 |
*/
|
|
|
454 |
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
|
|
|
455 |
void *visit(resource_declaration_c *symbol) {
|
|
|
456 |
/* no need to search through all the resource, so we only
|
|
|
457 |
* visit the global variable declarations...!
|
|
|
458 |
*/
|
|
|
459 |
if (symbol->global_var_declarations != NULL)
|
|
|
460 |
return symbol->global_var_declarations->accept(*this);
|
|
|
461 |
else
|
|
|
462 |
return NULL;
|
|
|
463 |
}
|
|
|
464 |
|
|
|
465 |
/* task_configuration_list program_configuration_list */
|
|
|
466 |
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
|
|
|
467 |
void *visit(single_resource_declaration_c *symbol) {
|
|
|
468 |
/* no need to search through all the resource,
|
|
|
469 |
* and there is no global variable declarations...!
|
|
|
470 |
*/
|
|
|
471 |
return NULL;
|
|
|
472 |
}
|
|
|
473 |
|
|
|
474 |
#if 0
|
|
|
475 |
/*********************/
|
|
|
476 |
/* B 1.4 - Variables */
|
|
|
477 |
/*********************/
|
|
|
478 |
SYM_REF2(symbolic_variable_c, var_name, unused)
|
|
|
479 |
|
|
|
480 |
/********************************************/
|
|
|
481 |
/* B.1.4.1 Directly Represented Variables */
|
|
|
482 |
/********************************************/
|
|
|
483 |
SYM_TOKEN(direct_variable_c)
|
|
|
484 |
|
|
|
485 |
/*************************************/
|
|
|
486 |
/* B.1.4.2 Multi-element Variables */
|
|
|
487 |
/*************************************/
|
|
|
488 |
/* subscripted_variable '[' subscript_list ']' */
|
|
|
489 |
SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
|
|
|
490 |
|
|
|
491 |
/* subscript_list ',' subscript */
|
|
|
492 |
SYM_LIST(subscript_list_c)
|
|
|
493 |
|
|
|
494 |
/* record_variable '.' field_selector */
|
|
|
495 |
/* WARNING: input and/or output variables of function blocks
|
|
|
496 |
* may be accessed as fields of a tructured variable!
|
|
|
497 |
* Code handling a structured_variable_c must take
|
|
|
498 |
* this into account!
|
|
|
499 |
*/
|
|
|
500 |
SYM_REF2(structured_variable_c, record_variable, field_selector)
|
|
|
501 |
|
|
|
502 |
|
|
|
503 |
#endif
|
|
|
504 |
};
|
|
|
505 |
|